Apparatus for opening the bores of drill steels



March 17, 1931. G C, PEARSQN I 1,797,08

APPARATUS FOR OPENING THE BORES OF DRILL STEELS Filed May 3l, 1928 6 Sheets-Sheet l Nimhv 17, 1931. PEARSQN 1,797,018

APPARATUS FOR OPENING THE BORES OF' DRILL STEELS Filed May 51, 1928y 6 Sheets-Sheet 2 "Tlf fw A 11 Il gwuc'nfoz Gas rev C". Fweso/v elliot mm1 Mar-Ch 17, 1931- GL c. PEARsoN 1,797,018

APPARATUS FOR OPENING THE BoREs o DRILLSTEELS G Sheets-Sheet 3 Filed May 3l, 1928 @um i 24, 4f 5 i5 43 n: 42. 4o

Malh 17, 1931. G, C, PEARSQN ,797,018 I APPARATUS Foa' OPENING THE BoREs oF DRILL sTEELs v Filed may 31, 1928 e sheets-sheet 4 $05 vwv C Fe: @eso/v attozneq Mam 17, 193i. G. C. REARSON APPARATUS FOR OPENNG THE BORES OF DRILL STEELS Filed May 3l, 1928 5 Sheets-Sheet 5 March 17, 1.931.

G. C. PEARSON APPARATUS FOR OPENING THE BORES OF DRILL STEELS Filed May 31, 1928 6 sheets-sheet 5,

d employed, designated 13, and preferably Patented Mar. 17, 1931 i llltllll@ STA GUSTAV C.v PEARSON, OF DENVER, COiORADO, ASSIGNOR TO GARDNER-DENVER COM- PANY, F DENVER, COLORADO, A CORPGRATON 0F DELAVARE APPARATUS FOR CPNNG THE EURES GF DRILL STEELS Application filed May 31,

The present invention relates to apparatus of the type disclosed and generally covered by the patent to Gustave M. Nell, No. 1,651,930, December 6, 1927.

The object is to provide a novel and compact structure of an elective character.

ln the accompanying drawings:

Figures 1A and 1B together constitute a top plan vien7 of the preferred embodiment of the invention, portions being shown in section. p

Figures 2A and 2B together constitute a vertical longitudinal sectional view through thestructure shown in Figure 1.

Figure 3 is a cross sectional View on the line 3-3 of Figures 1A and 2A.

Figure 4 is a detail longitudinal sectional vieu7 through the punch pin holding means and the centering means for the steel, showing the latter in a relation to position the bit of the drill steel.

Figure 5 is a detail sectional view on the line 55 of Figure 4.

Figure 6 is a sectional View on the line 6 6 of Figure 1A.

Figures '7 and 3 are cross sectional vievvs respectively on the lines 7 7 and 8-8 of Figure 6.

Figure 9 is a plan view or" the base.

Figure 10 is a side elevation of the same.

Figure 11 is a rear elevation.

Figure 12 is a diagrammatic view showing the various parts in order to more clearly illustrate the operation. Y

ln the structure disclosed, a support is 'comprising an angle bar that is adaptedto be suitably bolted to the base of a drill sharpener. Secured to this angle bar is a laterally extending brace 14, constituting additional securing means. The particular manner of mounting is, however, relatively immaterial. 0n thesupporting bar 13 is fixed a base 15 shown more particularly in Figures 9, 10 and 11. This base is provided at its front end With an upstanding portion 16 terminating at its upper end in a yoke 17. Outstanding ears 13 project from one side of the upstanding portion. The rear portion of the base is 'provided with guideways 19, in which 1923. Serial No. 281,905.

chamber or'pocket 22, and the bottom of this chamber or pocket may haveL an opening 23 to allow thepassageof scale and other detritus which may collect in said chamber.

In the yoke 17is detachably tted 'a Work positioning device, shown in the form of a collar 24 that is held' inpla-ce by fa set screw 25.k This collar is reversible.- In one face is formed grooves 26 adapted to receive the bit end of a drill steel, indicated at 27. The opposite end of the collar is provided with a conical socket 28 adapted to receive the butt -end of a drill steel as indicated in Figure 5. The collar being'detachable and reversible, obviously either end face may be made active.

Slidably engaged in the grooves'20 orP the guideways 19 are the Hanges 29 of the mounting 30 of a luidoperated hammer, preferably of the pneumatic type. This consists of a cylinder 31, in Which reciprocates a hammer pistonhead 32, having a valve tail piece 33. vThe structure and operation of this tool is substantially that of the tool disclosed in the patent to Daniel S. lVaugh, No. 1,114,949, dated Oct. 27,1914, and therefore is believed to need no further description here. It is operated by motive fluid supplied to a chamber 34, to which is connected `a supply hose having `communication with said chamber at 36. By referring to Figure 4, it will be noted that the front end of the toolcylinder '31 has fitted therein a bushing 37 carrying a housing 38 and in said housing is a reciprocatory tappet 39 having a reduced rear eXtension 40. This extension, when the tappet is in its rearmost position, is in the path of the piston head 32, but when the tappet is in its yforemost position in the housing 38, the said piston will not strike the extension 40. The front end of the tappet projects through the front end ofthe housing and is providedwith a socket 41 that-receives the rear enlarged end 42 of a punch pin 43. This pin is held in the socket and rigidly with the tappet by a plug 44 threaded into the socket and having a bearing against the front end of the enlargement 42. The plug has its outer end longitudinally Cil split as indicated at 44a and is caused to grip upon the shank of the pin 43 by being contracted when screwed into the socket 41. The

punch pin, as shown in Figures 2B and 4, and

5, passes through the positioning collar 24, and thus is adapted to enter the bore of a drill steel.

Fixed to the rear end of the support 13 is fluid operated means for moving the tool back and forth, This preferably consists of a cylinder 45 bolted, as shown at 46, to the rear end of the angle bar 13, and having therein. a piston 47. The piston preferably comprises a pair of disks 48 mounted on the reduced end 49 of a piston rod 50 and having between them -a disk 51 of cork, rubber or other material, the two collars 48 being tightly clamped against the intervening disk 51 by a nut 52 threaded on the reduced portion of the stem 49. The piston rod has its front end fitted into the compressionchamber 53 of the tool, and has a flange 54 abutting the rear end of the tool cylinder. This flange is overlaid by the head 55 of a shield 56 that bridges the space between the rear end of the tool and the front end of the cylinder 45 and is slidable over the latter (see Figure 2A). The

.head 55 is held in place by the usual side bolts 57 of the tool.

Formed on the front end of the cylinder 45 is an enlargement 58 providing an internal supply chamber 59 within which communi- Cates a nipple 60. To this nipple is connected the air supply hose 35. Into one end ofthe chamber 59 is threaded a hollow plug 61, the inner end of which has a port 62 affording communication between the chamber 59 and the interior of said plug 61. A seat formed about said port 62 has cooperating with it a valve 63 that opens outwardly and is normally held closed by the pressure of the fluid in the pipe 56 and by a spring 64 bearing thereagainst and borne against by aV plug 65 threaded into theV plug 61. To said plug 65 can be connected by any suitable means a sup ly line 66.

Tie enlargement 58 on the opposite side to the plug 61 is provided with an open-ended valve casing 67. This valve casing is disposed longitudinally of the apparatus and its interior is in communication with the supply chamber 59 through the medium of ports 68. The end portions of the valve casing are provided with internal annular distributing grooves-69 and 70. The groove 69 has leading therefrom a passagewayv 71 that opens into'the front end of the cylinder 45 in advance of thepiston. The other groove has a passageway 72 leading therefrom that opens into the rear end of the cylinder 45 in rear ofthe piston. A reciprocatory distributing valve 73 is located in the valve casing 67and has a central notch 74 in constant communication with the ports 68. On opposite sides Qffsaiclnoteh and le commentati@ #here with are annular grooves 75 and 76 that are thus in constant communication with the supply chamber 59. The valve is furthermore provided outside said grooves 75 and 76 with enlargements or flanges 77 and 78 adapted ment by a cross pin 8O engaged in a cut-away portion 81 formed on the rear extension 0f said valve that projects beyond the valve casing, the end walls of said cut-away portion constituting abutments that engage said cross The front end of the valve 73 is connected to an actuating rod 82 that extends longitudinally of the machine to the front end thereof and is there pivotally connected as shown at 83 (see Figure 1B) to an actuating lever 84 fulcrumed at 85 on the ears 18 of the upstanding portion 16 of the base 15. This lever is preferably surrounded by a guard yoke 86, the ends of which are fitted into sockets 87 in the. base and held by set screws 88.

To assist the feeding means and the hammer tool in their rearward or withdrawal movement, a spring 89 is employed coupled at 90 to the tool and at 91 to the supporting bracket of the cylinder 56.

The operation of the apparatus is substantially as follows: `When a drill steel has been properly shaped, sharpened or otherwise operated upon, and while its end is still heated sufficiently to permit the working of the metal, it is held against the positioning collar 24. The operator now moves the handle 84 in a direction to push the distributing valve 73 rearwardly. As this is done, the valve stem 79 by riding up the inclined bottom of the notch 74, will be moved outwardly. The valve 63 is thus opened. As a consequence motive fluid will pass through the hose 35 to the tool and the hammer piston will be thrown into operation. At the same time the rearward movementof the distributing valve 73 causes the groove 76 to communicate with the groove 70 and thus motive fluid flows into the rear end of the cylinder 45 behind the piston, moving said piston forwardly. This obviously causes the forward movement of the fluid actuated tool as a whole and presses the punch pin 43 into the bore of the steel. The result is that the tappet 39 is held and its extension 40 is in a position to be struck by the piston 32 and thus hammered so that the pin punch is driven into the drill steel.

When the operation is completed, the handle 84 is moved in the opposite direction to cause a forward movement of the valve and this movement is carried beyond the central position or vthat shown in Figure 1A.

The result is that the valve 63 is again opened and the front groove 75 of the distributing Avalve 3 is brought into, communication with hvo the annular groove 69. vNow fluid is admitted to the front end of the lfeeding cylinder' Lloginadvance ofthe piston and said pistn is moved rearwardly. At the same timemotive fluid is being supplied to the tool,v.so,that the piston 32 is continuing its operation. This continued operation of the hammeihas beenl found advantageous in the extraction of the pin from thesteel. This may be explained by stating that the punch pin-when driven-four or five inches into the steelis obviously very tightly held therein, and the problem of getting it out is quite as importantas putting it in. The power of the motive fluid (usually air under pressure) is ordinarily insufiicient to abstract it b y the .Clirect pull alone due to the reversal of the feeding means. As already explained, during the driving of the punch pin into the steel, the pistonhammer 32 strikes the rear extension of the tappet, but when the reversal takes place the tool being pulled rearwardly andthe pin 43 being stuck in the drill steel,.thetappet extension 40 is relatively moved forwardly so that the piston will not strike the tappet. On the back stroke of the hammer piston, however, the stoppage of said piston is caused by an air cushio-n in the pocket, the air therein being quickly compressed to a high degree so thata real rearward shock or blow is givento the cylinder ofthe tool. The kinetic energy orforce of these rapidly repeated backward blows is transmitted through the housing 38 to the tappetwhich is now against the front end of said housing. There is therefore now transmitted in addition to the steady pull of the feeding means a rapid ,series of backward or pin pulling blows by the piston hammer and the combined action of the two instrumentalities effects the loosening and withdrawal ofthe pinfrom the bore of the steel' It will thus be noted that the kinetic energy of a series of driving blows is delivered tothe pin when said pin is introduced and 4also that the'kinetic energy of a series of effective'pulling blows is imparted when the pin is being withdrawn, and that this change is effected by shifting the piston hammer an-d its path of movement with respect to the pocket.

F rom the foregoing, it is thought that the construction, operation and many advantages of the herein described invention will be apparent to those skilled in the art, without further description and it will be understood that various changes in the size, shape, proportion and minor details of construction may be resorted to without departing from the spirit or sacrificing any of the advantages of the invention.

What I claim, is:

l. In apparatus of the character set forth, the combination with a punch pin for entering the bore of a drill steel, of a device having grooves corresponding to and receiving the cuttingA edges of the steel for centering the steel with its bore in position to receive the punch pin, and means for hammering the punch pin to cause it to movewith respect'to the centering device.

Q. In apparatus of the character set forth, the combination with a punch pin for entering the bore of a drill steel, of means for hammering the punch pin, a yoke that surrounds the punch pin, and a reversible steel positioning device detachably mounted in the yoke and having hole therethrough for the passage of the pin and having means atits opposite ends for positioning respectively the buttand bit ends of a drill steel.

Tnapparatus of the character set forth, the combination with a base, of a fluid operated hammer tool slidably mounted thereon, a yoke on the base in advance of the tool, an abutment head detachably fitted in the yoke and having an opening therethrough, a punch pin carried by the tool and movably passing through the opening, and means formed on the abutment head -ror centering either end of a steel in position to receive the'punch pin, and including grooves radiating from the opening and adapted to receive thecutting edges of the drill bit.

l. ln apparatus of the character set forth, the combination with a punch pin for engaging the bore of a drill steel, of a movable fluid operated tool that carries said pin and operates on it, a fluid operated feeding means formoving the tool, means for supplying motive fluid to the tool and to the feeding means, a valve controlling the supply to the tool, another valve controlling the supply to the feeding means, and a valve actuating device common to both valves.

5. Tn .apparatus of the character set forth, the combination with a punch pin for engaging the bore of a drill steel, of a movable fluid operated tool that carries said'pin and operates on it, a fluid operated feeding means for moving the tool, a motive fluid supply chamber,passageways leading from the sup ply chamberto the tool and tothe feeding means, .valves controlling the passageways, one valve being actuated by the other valve, and means for manually actuating said other valve.

6. Tn apparatus of the character set forth, the ccmbinationwith a punch pin for engaging the bore of a drill steel, of a movable fluid operated tool that carries said pin` and operates on it, reversibly operated feeding means for moving the tool in opposite directions, means for supplying motive fluid to the tool to actuate it, means for supplying motive fluid to the rfeeding' means for moving it in opposite directions, a valve for controlling the supply of fluid to the feeding means and governing the direction of its movement thereby, and a valve controlling the supply of motive fluid to the tool, said latter valve being actuated and opened by the first valve whenever the same is moved to supply fluid to the feeding means an-d irrespective of the direction said feeding means is operated.

7. In apparatus of the character set forth, the combination with a punch pin for engaging the bore of a drill steel, of a movable 'fluid operated tool that carries said pin and operates on it, a reversibly movable fluid operated feeding means for moving the tool in opposite directions, a motive fluid supply chamber, a supply passageway leading from the chamber to the tool, a valve controlling the said passageway, a valve casing in communication with the chamber, distributing passageways leading from the valve casing to the feeding means for effecting the opposite movements of the feeding means, a valve controlling said distributing passageways, manual means for actuating one of the valves, and means for causing the actuation of the other valve upon the operation of the manually actuated valve.

8. In apparatus of the character set forth, the combination with a punch pin for engaging the bore of a drill steel, of a movable fluid operated tool that carries said pin and operates on it, a reversibly movable fluid operated feeding means for moving the tool in opposite directions, a motive fluid supply chamber, a supply passageway leading from the chamber to the tool, a valve controlling said passageway, a valve casing in comniunication with the chamber, distributing passageways leading from the valve casing to the feeding means for eecting the opposite movements of the feeding means, a valve controlling said distributing passageways, manual means for actuating the second valve to open either distributing passageway, and means for causing the opening of the first valve from the second valve.

9. In apparatus of the character set forth,

y the combination with a punch pin for engaging the bore of a drill steel, of a movable fiuid operated tool that carries said pin and operates on it, a reversibly movable fluid operated feeding means for moving the tool in opposite directions, a motive fluid supply chamber, a supply passageway leading from the chamber to the tool, a valve controlling said passageway, a valve casing in communication with the chamber, distributing passageways leading from the valve casing to the feeding means for effecting the opposite movements of the feeding means, a reciprocatory valve controlling said distributing passageways, manual means for actuating the reciprocatory valve, and means for opening the first valve when the reciprocatory valve is moved to open position in either direction.

10. In apparatus of the character set forth,

the combination with a punch pin for engaging the bore of a drill steel, of a movable fluid operated tool that carries said pin and -operates on it, a reversibly movable fluid operated feeding means for moving the tool in opposite directions, a motive fluid supply chamber, a supply passageway leading from the chamber to the tool, a reciprocatory valve controlling said passageway, a valve casing in communication with the chamber and disposed transversely to the said valve, spaced distributing passageway-s leading from the valve casing to the feeding means for supplying fluid thereto and moving the feeding means in opposite directions, a reciprocatory valve in the valve casing movable in one direction to open one passageway and in the other direction to open the other passageway, said reciprocatory valve having a notch, the first valve having a stem in the notch and being moved by the walls thereof, and means for reciprocating the second valve.

1l. In apparatus of the character set forth, the combination with a steel positioning device, of a fluid operated hammer, a tappet onerated on by the hammer and having a socket, a punch pin having an enlarged head in the socket, and a holding plug having a longitudinally split compressible outer end, said plug surrounding the pin, abutting its enlarged head and having its split outer end threaded and screwed into the walls of the socket.

12. In apparatus of the character set forth, the combination with a steel positioning device, of a fluid operated hammer, a tappet operated on by the hammer and having a socket opening through its front end, a punch pin having an enlarged head in the socket, said head having a tapered front end, and a holding plug threaded into the socket and having a socket in its rear end that receives the tapered end of the head of the punch pin, said plug having its front end slotted and said slots extending into the socket thereof.

In testimony whereof, I afx my signature.

GUSTAV C. PEARSON.

lib' 

